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RE: st: RE: Testing normality of a continuous predictor variable in a logistic model


From   "Feiveson, Alan H. (JSC-SK311)" <alan.h.feiveson@nasa.gov>
To   <statalist@hsphsun2.harvard.edu>
Subject   RE: st: RE: Testing normality of a continuous predictor variable in a logistic model
Date   Tue, 27 Nov 2007 15:02:39 -0600

The predictor certainly doesn't have to be normally distributed, but if
it's too skewed there's a higher risk of bias caused by values with
large leverage. 

Al Feiveson

-----Original Message-----
From: owner-statalist@hsphsun2.harvard.edu
[mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Maarten buis
Sent: Tuesday, November 27, 2007 11:36 AM
To: statalist@hsphsun2.harvard.edu
Subject: Re: st: RE: Testing normality of a continuous predictor
variable in a logistic model

--- "Soremekun, Seyi" <S.Soremekun@warwick.ac.uk> wrote:
> Because it is a logistic and not probit regression you are attempting,

> it actually does not matter if your variables are normal or not.

Why would it matter whether the explanatory variables are normaly
distributed in a probit regression?

-- Maarten

-----------------------------------------
Maarten L. Buis
Department of Social Research Methodology Vrije Universiteit Amsterdam
Boelelaan 1081
1081 HV Amsterdam
The Netherlands

visiting address:
Buitenveldertselaan 3 (Metropolitan), room Z434

+31 20 5986715

http://home.fsw.vu.nl/m.buis/
-----------------------------------------


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